/*
 * Copyright (C) 2010 A. Horn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.mcsoxford.rss;

import java.text.ParseException;
import java.text.SimpleDateFormat;

/**
 * Internal helper class for date conversions.
 * 
 * @author Mr Horn
 */
final class Dates {

  /**
   * @see <a href="http://www.ietf.org/rfc/rfc0822.txt">RFC 822</a>
   */
  private static final SimpleDateFormat RFC822 = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss", java.util.Locale.ENGLISH);
  private static final SimpleDateFormat RFC822_2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", java.util.Locale.ENGLISH);

  /* Hide constructor */
  private Dates() {}
  
  /**
   * Parses string as an RFC 822 date/time.
   * 
   * @throws RSSFault if the string is not a valid RFC 822 date/time
   */
  static java.util.Date parseRfc822(String date) {
    try {
      return RFC822.parse(date);
    } catch (ParseException e) {
    	try {
			return RFC822_2.parse(date);
		} catch (ParseException e1) {
			e1.printStackTrace();
		}
      throw new RSSFault(e);
    }
  }

}

